I do alot of "commuting" on a bike, going from place to place along flat roads, however its more for fun than anything else. One question I have always pondered is how high your seat should be for maximum efficiency. I've always had it at about handlebar level, this seemed comfortable and efficient. But when I look at magazines or pictures on the net involving XC bikes I see the seats are way higher than the bars. I tried this and it worked alright, a little uncomfortable though. It seemed to involve the calf muscles more than pedaling with a lower seat. Needless to say I wasn't used to it. My question is, how high should your seat be for maximum flatland efficiency? Is the higher seat just for hillclimbing? What about foot placement on the pedals, middle or more towards the toes? Thanks for the insight!